Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 413
al outerOpal enclosing and opal outer . 100 per cent91.2 per cent85.1 per cent82.7 per cent diffused as in lighting large rooms with light finish. Reflectors ofthis general type are now being manufactured in such a form thatthey may be built in and become part of the ceiling of the room to be… … Fig. 80. Enclosed Arc Lamp Fitted with Shade and Concentric Diffisp- a greater area and the light is so diffused as to obliterate shadows inthe vicinity of the lamp. Table XXIII gives the efficiency ofdifferent globe combinations for street lighting, assuming the opalinner and the clear outer…
Electrical engineering
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